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Citadel Heating and Cooling advertises HVAC installation, design, maintenance and repairs, along with water-heater service and replacement. Its website also lists gas and oil heating-system installation and repairs, plus oil-tank replacement. The company says it has 20 years in business.
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1 change recorded — last scanned Oct 31, 2026.
Typical Connecticut range for this kind of work, from regional averages — not a quote from Citadel Heating and Cooling. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$4,700 – $10,700
Typical HVAC project around $7,700